I have spend over 4 hours for this.. here is the question masters, very 
simple.
str=String.new
str="[1,2][2,1][3,1][4,1]"

now I want to print this string as
[1,2],[2,1],[3,1],[4,1]
in other word I want to add comma between those ][ and make them look 
like ],[
I tried gsub with hundred different possibilities but no luck,

second problem
if my the same str has
[1,2][2,1][3,1][4,1],
and I want to get rid of last comma from the list, I tried chop chomp 
and all that but it gets ri of alot more than comma at the end. how can 
I get rid of last comma from the list? from [1,2][2,1][3,1][4,1], to 
[1,2][2,1][3,1][4,1]


any help will be appreciated.
thank you


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